197870861 has 12 divisors (see below), whose sum is σ = 206444700. Its totient is φ = 189630720.

The previous prime is 197870801. The next prime is 197870867. The reversal of 197870861 is 168078791.

197870861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 117050761 + 80820100 = 10819^2 + 8990^2 .

It is a de Polignac number, because none of the positive numbers 2^k-197870861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197870867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103805 + ... + 105693.

It is an arithmetic number, because the mean of its divisors is an integer number (17203725).

Almost surely, 2^197870861 is an apocalyptic number.

It is an amenable number.

197870861 is a deficient number, since it is larger than the sum of its proper divisors (8573839).

197870861 is a wasteful number, since it uses less digits than its factorization.

197870861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060 (or 2029 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 197870861 is about 14066.6577764585. The cubic root of 197870861 is about 582.7209263475.

The spelling of 197870861 in words is "one hundred ninety-seven million, eight hundred seventy thousand, eight hundred sixty-one".